public override WaitDialogResult <TResult> TryCreateWaitDialog <TResult>(string title, string message, Func <WaitDialogContext, Task <TResult> > onWaitAsync)
{
Debug.Assert(_joinableTaskFactory.Context.IsOnMainThread);
var result = _waitDialogFactory.CreateInstance(out var dialog2);
if (result != VSConstants.S_OK)
{
return(null);
}
if (dialog2 is not IVsThreadedWaitDialog4 dialog4)
{
Debug.Fail("This is unexpected, the dialog should always be an IVsThreadedWaitDialog4");
return(null);
}
var context = new DefaultWaitDialogContext();
var callback = new Callback(context);
dialog4.StartWaitDialogWithCallback(title, message, szProgressText: null, varStatusBmpAnim: null, szStatusBarText: null, fIsCancelable: true, iDelayToShowDialog: 2, fShowProgress: false, iTotalSteps: 0, iCurrentStep: 0, pCallback: callback);
TResult waitResult = default;
_joinableTaskFactory.Run(async() =>
{
try
{
waitResult = await onWaitAsync(context).ConfigureAwait(false);
}
catch (TaskCanceledException)
{
// Swallow task cancelled exceptions, they represent the user cancelling the wait dialog.
}
});
dialog4.EndWaitDialog(out var cancelledResult);
var cancelled = cancelledResult != 0;
var dialogResult = new WaitDialogResult <TResult>(waitResult, cancelled);
return(dialogResult);
}
public Callback(DefaultWaitDialogContext waitContext) => _waitContext = waitContext;
